Answer: The correct answer is Area.
Step-by-step explanation:
Pressure exerted on an object is defined as the ratio of force applied to the surface area.
Mathematically,

Where, p = pressure
F = force applied
a = surface area
From the above relation, pressure is inversely related to area. As, the pressure increases, the area will be small and vice-versa.
So, when force of the explosion was focused on a smaller area, then the the pressure of the explosion on the window was greater.
Hence, the correct answer is Area.